Stay-bolt and means for screwing the same in place.



W. L. DECKER. STAY BOLT AND MEANS FOR SGREWING THE SAME IN PLACE.APPLIOATION FILED FEB. 10, 1912.

- INVENIOR ll zl/zam Jorenzo Jackal ATTORNEYS Patented Oct. 15, 1912.

I I? Milli? ii? A! O E F WILLIAM LORENZO DECKER, OF MOLLENDO, PERU.

STAY-BOLT AND MEANSZIFOR SGREWIN'G- THE SAME IN PLACE.

Specification of Letters Patent.

' Application'filed February 10, 1912. Serial No. 676,737.

To a]! whom it may concern:

it known that I, \VILLIAM LORENZO l)ECKER, a citizen of the! UnitedStates, and a resident of Mollendo, Peru, South America, have invented anew and Improved Stay- Bclt and Means for Screwing the Same in Place, ofwhich the following is a full, clear, and exact descript on.

The invention relates to boilers, and its .object is to provide a newand improved stay bolt and means for screwing the'same in position wit-ha view to rlgidly connect the inner and outer walls of the boiler witheach other and thus prevent the walls from bulging under pressure, andto permit of conveniently and quickly screwing the stay bolt in place orremoving the same when necessar Forthepurpose mentioned, use is-made ofa stay bolt provided at its ends with conical threads adapted to bescrewed into tapped holes in the inner and outer walls of the boiler,the threads being either right-hand or left-hand, and each thread has astraigl'rt base and a, slanting back, the backs of the threads at oneend of the stay bolt slanting in opposite directions to the backs of thethreads at theother end of the stay bolt. Use is also made of a guidenut for engagement with one threaded end of the said bolt, a driving keymounted to turn in he said guide nut and having a gripping fac adaptedto engage the end of the stay bolt, and mannally-cont-rolled means forturning the said key with a view to turn the stay bolt and thus securethe latter in place. i

A practical embodiment of the invention is represented in theaccompanying drawings forming a part of this specification, in whichsimilar characters of reference indicate corresponding parts in all theviews.

Figure 1 is a side elevation of the stay bolt partlyin position on. theinner and outer walls of the boiler, the boiler walls and guide nutbeing shown in section; Fig. 2 is a like view of the same showing thestay bolt in place and the'driving means detached; Fig. 3 is a sideelevation of the reamer and tap for reaming and threading the bolt holesin the inner and outer walls of the boiler; Fig. 4 is a side elevationof the driving key for screwing a stay bolt in position; Fig. 5 is aface view of the same;

.Fig. 6 is a side elevation of the driving key stay bolt D through thehole B to gage the threaded hole B. It will also be for unscrewing astay bolt Fig. 7 is a face View of the same; and Fig. '8 is a crosssection of the ratchet leve The inner and outer walls A and A of aboiler are provided with oppositely-disposed threaded or tapped holes B,B formed by the use of a reaming and tapping tool C provided with spacedthreads C, C and reamcrs C C adjacent the'said threads G, C so that whenthis tool is placed in position in the bclt'holes of the inner and outerwalls A and A and turned then the said bolt holes are reamed and theconical threads B, B tioned.

The stay bolt 1) consists of a shank D provided at its ends with threadsD D adapted to, screw into the threaded holes B and B to effectivelyconnect the walls A and A with each other. The threads D previouslymenand D are either right-hand or left-hand and of the same pitch, andeach thread has a straight base and a slanting back, the threads D Dhaving their backs, however, slanting in opposite directions. as plainlvand C of the reamer C being correspondingly shaped and arranged to formcorresponding threads B, B in the walls A, A of the boiler. V

By arranging the threads B, B and D D in the manner described and shownthe threads 1) and D pull against each other on screwing the stay boltDin'place, thereby drawing the stay bolt perfectly tight in position witha view toprevent leakage of either steam or water.

In practice the stay bolt D is preferably screwed in place from theinside of the boiler or fire box, and no riveting or calking whatever isrequired as far as the stay bolt is concerned, and the stay bolt can bereadily screwed in place or screwed out whenever it is desired to do so.In order to permit of conveniently screwing the stay bolt D inposition,-the inner or base end of the thread D is somewhat less indiameter than the inner or apex end of the thread D to permit ofconveniently passing the thread D of the finally ennoticed that bymaking the threads D and D conical an exceedingly strong hold is had ofthe stay bolt D on the walls A and A.

indicated in Figs. 1 and 2; the threads C" Patented 0ct.15,191l2.

tapped to provide In order to screw the said stay bolt in position useis made of the following means: A

guide nut E is provided with a screw thread 5 E and a smooth guideopening E concentric with the thread-E, which latter is adapted to screwon the out-er or base end of the thread D of the-stay bolt D, as plainlyindicated in Fig. 1. A key F having a head 'F' is employed for turningthe stay bolt D to final position, the said head F be-',

ing mounted to turn in an opening E and having on its face grippingteeth adapted to engage the outer end of the stay bolt D. The key F isprovided with a shank F terminating in a polygonal'end F adapted to Iengage a correspondingly-shaped opening or v bore G formed in a ratchetwheel G mounted to turn in suitable bearings arranged in a lever Hcarrying a pawl I engaging the teeth of the ratchet wheel G so as toturn the same on imparting a swinging motion in --one direction to thelever H.

In using the device, the stay bolt D'is partly placed in position on thewalls A and A, as indicated in Fig. 1, and then the nut E is screwed onthe outer portion of the thread D so that the inner face of the nut Eabuts against the outer face of the 'boiler wall A. The driving key F isnow placed in position in the nut E so that the gripping face-of the.head F engages the outer end ofthe stay bolt D, and then the operatorturns the lever II so as -to.impart intermittent turning motion to thekey F with a view to turn the stay bolt D so as to screw the same homein the walls A and A, the stay bolt D during this operation unscrewingin the nut E. When it is desired to unscrew a stay bolt for one reasonor another, use is made of a driving key F having a head F providedon-its face with gripping teeth extending in an opposite direction fromthe teeth of the gripping head F, and in using this key F it is turnedinan opposite direction by the ratchet lever H to unscrew the bolt D fromthe walls A and A.

From the foregoing it will be seen that by the arrangement described,the stay bolt D can be readily screwed in position on the walls A and Aof the boiler, or unscrewed therefrom, and when the stay bolt is screwedin place it rigidly connects the walls A and A with each other toprevent bulging of the same when the boiler is in use.

Having thus described my invention, I

claim as new and desire to secure by Letters Patent:

1. A stay bolt, comprising a shank and a set of conical threads at eachend of the shank, each thread having a straight base and a slantingback, the backs of the threads at one end of the stay bolt slanting inan opposite direction to the backs, of the threads on the other end ofthe stay bolt, the inner ends of the threaded portions of the stay boltbeing of greater diameter than the shankportion of said bolt.

2. In combination with a stay bolt having threads at the ends forscrewing into tapped holes in the inner and outer boiler walls,

a guide nut screwing on the threads at one end of the stay bolt, andadriving key mounted to turn in the said guide nut and adapted to engagethe end of the stay bolt to turn the latter.

3,. In combination with a stay'bolthaving a set of threads at each end,a guide nut having a screw thread adapted to screw on 3'- the outer endof one of :aid sets of threads, the guide nut having a smooth'guideop'ening concentric with the thread, and a driving key having ahead mounted to turn in the said guideopening in the nut, the face .ofthe said head being provided with gripping teeth for engaging the outerend of the stay bolt.

4. In combination with a stay bolt hzwing' threads at the ends forscrewinginto tapped holes in the inner and outer boiler walls, a

guide nut screwing on one of the saidv threads, a driving key mounted toturn in the said guide nut and adapted to engage the stay bolt to turnthe same, anduneans for turning the said driving key.

5. In combination with a stay bolt having threads at the ends forscrewinginto tapped holes in the inner and outer boiler walls, a guidenut screwing on one of the said threads, a driving key mounted to turnin the said guide nut and having a head and av shank, the head beingprovided at. its

face with gripping teeth for engagement with the end of the stay bolt,and means for turning the driving key.-

In testimony whereof I have signed my name to'this specification'in thepresence of two subscribing witnesses.

, WILLIAM LORENZO DECKER.

Witnesses;

V. VARGA, S. F. Mnnonz.

